It is possible that events occur entirely at random or even all at once and our minds are the outport of a kind of search engine or algorithm that filters through it all and puts it in the kind of order which we take for the arrow of time. It would look a lot like a mental disorder to be the outport of an engine that did not filter through events in a way that puts them in the kind of order which we take for the arrow of time. Metaphysically speaking, this would not be a disorder so much as a difference.